Re: Ways to deprecate /sys/devices/system/memory/memoryX/phys_device ?

[David Hildenbrand]

> Am 11.09.2020 um 22:09 schrieb Luck, Tony <tony.luck@xxxxxxxxx>:
> 
> 
>> 
>> How would it behave after hotplugging a single DIMM  - I assume a single page will only be mapped to that DIMM (otherwise a lot of stuff would habe to be moved around. Would the mapping change after a reboot - especially can a DIMM that could get hotunplugged before suddenly no longer be hotunplugged individually?
> 
> 
> We don't currently have any platforms that would allow hot adding at the DIMM level.
> The Brickland generation of E7 Xeon servers (Ivybridge, Haswell, Broadwell) allowed
> for hot plugging a riser card that contained up to 12 DIMMs.
> 
> If you did add memory it would have to appear at the top of the system physical
> address space. No interleave (unless you added more than one DIMM in a single
> operation).  After a reboot the system would likely shuffle things around to and
> interleave.
> 

Thanks a lot - so I‘m really spoiled by hot(un)plug capabilities in virtualized environments :D

> -Tony